Morphology Data of Bagrus filamentosus
Identification keys
Abnormalities
Main Ref. Risch, L.M., 2003
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
Remarks

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral elongated
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales
Diagnosis

Diagnosis: body rather elongate, 6 times longer than deep; occipital process 3-5 times longer than broad (Ref. 57125). 10-11 branched dorsal-fin rays (Ref. 57125), 1st extended into long filament, following into shorter ones (Ref. 7324, 31256, 57125). Longest filament comprised 2 to 3 times in standard length (Ref. 3036, 57125). Predorsal length comprised 2.6 to 2.9 times in standard length; head width 1.6-1.9 times in head length; width of premaxillary tooth plate 2.4-2.8 times in head length; upper caudal-fin lobe often prolonged into a short filament (Ref. 7324, 57125). Upper caudal-fin lobe comprised 2.5 to 3.5 times in standard length (Ref. 57125).

Description: snout slightly rounded and protruded (Ref. 3055). Maxillary barbel 1.5-3.2 times head length (Ref. 3032), reaching the anal fin in juveniles and the pectoral fin in adults; nasal barbel 0.2 times head length (Ref. 3055). External mandibulary barbel 0.6-1 times head length (Ref. 3032), 1.5-2 times the length of the internal mandibulary barbel (Ref. 2756). Internal mandibulary barbel 0.42-0.56 times head length (Ref. 3069). Eyes supralateral (Ref. 2756). Occipital processus long, close to the interneural (Ref. 3055). Dorsal spine smooth (Ref. 3069). Only the first branched ray is filamentous in juveniles (Ref. 3069, Ref. 2756). Adipose fin height 4.1-5.7 times into length of its base (Ref. 3036), 1.75 times longer than the dorsal fin (Ref. 3056, Ref. 3055). Distance between dorsal and adipose fin small (Ref. 2756). Caudal fin deeply forked (Ref. 3056). Lower lobe of caudal fin rounded and without filament (Ref. 3056). Pectoral filaments often present (Ref. 13851, Ref. 3036, Ref. 3055), reaching the pelvics (Ref. 3069). Strong pectoral spine present (Ref. 3069, Ref. 3032). Pelvic fins more inserted under 7-8 branched rays of dorsal fin (Ref. 13851, Ref. 3036).

Coloration: life specimens greyish or yellowish, with a white belly (Ref. 7324, 57125). Fins grey, often tinged with rose (Ref. 7324, 13851, 57125). Caudal fin sometimes with black spots; juveniles are blackish (Ref. 7324, 57125).

Ease of Identification

Meristic characteristics of Bagrus filamentosus

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle
Barbels
Gill clefts (sharks/rays only)
Gill rakers
on lower limb 8 - 12
on upper limb 4 - 5
total
Vertebrae
preanal
total

Fins

Dorsal fin(s)

Attributes
Fins number
Finlets No. Dorsal   
Ventral  
Spines total 1 - 1
Soft-rays total 10 - 11
Adipose fin

Caudal fin

Attributes forked; with dorsal and ventral filament

Anal fin(s)

Fins number
Spines total
Soft-rays total 12 - 13

Paired fins

Pectoral Attributes  
Spines     1
Soft-rays   10 - 11
Pelvics Attributes  
Position    
Spines     
Soft-rays   6
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